I am setting up a spare router in case my WAG54 dies at some later date. I have 2xVFX lines on an SPA2102 working fine through the WAG. The spare router is an SMX 7904WBRA2-AU which is ADSL2+ and says it is "voip compatible". Is there any settings I need to consider on the SMC router to get the 2102 working or does it look through the router in some way. I don't quite understand how the VFX communicates through the router with the WAN.

I am setting up a spare router in case my WAG54 dies at some later date. I have 2xVFX lines on an SPA2102 working fine through the WAG. The spare router is an SMX 7904WBRA2-AU which is ADSL2+ and says it is "voip compatible". Is there any settings I need to consider on the SMC router to get the 2102 working or does it look through the router in some way. I don't quite understand how the VFX communicates through the router with the WAN.

Cheers Andy

Hi Andy,

It should work just as it does with the WAG54, however here are a couple troubleshooting steps to try if it doesn't.

1. Turn off SIP ALG, if there is a setting for it on the SMX 7904WBRA2-AU 2. Assign a static IP to the SPA2102 & port forward SIP ports to the SPA2102. SIP Ports/Info FROM: 58.28.20.150 TCP/UDP Ports 8060 – 8065 Signalling TCP/UDP Ports 5060 – 5065 Signalling UDP Ports 35384 – 37384 Media http://portforward.com/ - this site can help with basic instructions on how to forward ports on your router.

I would recommend setting up your SMX 7904WBRA2-AU with your current ADSL settings and giving it a try.

This is quite bizarre. Having had the WAG54 working fine for 5 1/2 years I had this feeling earlier this week I needed a backup in cast he WAG fell over. This morning, 3 days after setting up the spare SMC7904WBRA2, the WAG failed giving intermittent connection on the ADSL, maybe it was the frosty morning that did it.

Anyway installed the SMC7904WBRA2 and everything worked fine once I got the right login correct. Even VFX works fine without further setup of the SMC.

andynz: This is quite bizarre. Having had the WAG54 working fine for 5 1/2 years I had this feeling earlier this week I needed a backup in cast he WAG fell over. This morning, 3 days after setting up the spare SMC7904WBRA2, the WAG failed giving intermittent connection on the ADSL, maybe it was the frosty morning that did it.

Anyway installed the SMC7904WBRA2 and everything worked fine once I got the right login correct. Even VFX works fine without further setup of the SMC.

Over 5 years is a long time for a "modern" switch mode power supply. The WAG might work fine if you replace the power adapter, if you could be bothered. The routers are well designed and typically only suffers from overheating due to being consumer grade. The power adapter on the other hand is made by a 3rd party.

I spoke to soon. I found that the VOIP line was getting dropped about 10 seconds after each Registration on the 2102. The SMC7904WBRA2 does seem to have a problem with passing through VOIP. I set up as per Cameron's suggestion the ports: